- Human Aliens: Most party members from Expel. Downplayed with Opera and Ernest, who have a third eye in their forehead.
- Mutually Exclusive Party Members: Recruiting Asthon prevents you from obtaining Opera and Ernest; and choosing Precis prevents you from getting Bowman. Leon will only joins you if you choose Claude as the protagonist, while Dias can only be recruited with Rena.
- Optional Party Member: Claude and Rena are the only mandatory party members. Everyone else is optional, and some characters cannot be recruited in the same playtrough.
- Space Elves: The Nedian characters, whose inhabitants are very similar to Tolkien elves.
- You Gotta Have Blue Hair: Rena, Leon and Dias have blue hair. Celine's hair is purple.
Claude C. Kenny
Voiced by: Yuji Ueda (Japanese, original), Daisuke Namikawa (Japanese, remake), Hiro Yuki (Japanese, anime), Jimmy Freeman (English, original), Spike Spencer (English, remake), Matt Hill (English, anime)
The hero of the game. Son of Ronyx Kenny and Illia Silvestri, his desire to prove himself on his own merits leads him to get too close to an alien device that teleports him to an uncharted planet. There, he saves one of the local girls with his phaser, and is mistaken for a legendary hero.
- All Men Are Perverts: During a PA with Welch in Fun City, Claude can wind up buying what is obviously an adult magazine, admiring the cover girl and her assets, out loud. Welch was not surprised about it.
- Badass Normal: He's pretty ordinary, but proves to be deadly with a sword on skill alone.
- Butt-Monkey: Not as bad as Ashton, but several PAs in Rena's storyline serves nothing more than to make jokes at Claude's expense.
- Chick Magnet: Every female party member can end up displaying some sort of attraction to him. Even at the same time (for example, a PA with Rena and Precis has the two arguing about him).
- Cool Big Bro: a mild variation with Leon if you recruit him (who coincidentally is only available as a permanent party member if you play as Claude)
- Crazy Jealous Guy: Gets rather irrational whenever he finds out Rena's hanging out with Dias.
- Deuteragonist: If Rena is chosen as the lead.
- Gone Horribly Right: Claude's repeated attempts to reach the Calnus with his communicator. By the time they finally got to him, it was the point that Claude didn't want to leave his new friends behind.
- Good Old Fisticuffs: Primarily a swordsman, but he also has a couple fist techniques (some of which were also used by Illia).
- Hair of Gold, Heart of Gold: Like his mother, Claude is generally friendly and well-meaning, save some early moments of dickishness when Dias is involved.
- I Choose to Stay: Halfway through Ell, the Calnus has finally picked up Claude's communicator signal and they forcibly teleport him out of Expel. When Claude finds out from his father about the planet's approaching destruction, he asks to be sent back, but Ronyx uses his authority as admiral to put Claude in his place, believing it to be for Claude's own safety. Claude insists, using an excuse that he wants to say goodbye to his friends. Ronyx relents, but when Claude is sent back to Ell, he intentionally leaves behind his communicator so that they won't be able to track him again.
- One of his paired endings with Rena had him living in Expel with her after the events of the game. Rena asked Claude if he regretted not going back to Earth to which he answered that he was still on Expel because he wanted to. Subsequent games make it clear that this ending is non-canon. Another ending with Opera has him living with her on Tetragenes.
- Imagine Spot: the ladies once tried wondering where Claude got his fashion sense from, and then imagine him first in a knight's bulky armor, and after that, for some reason, in drag.
- I'm Standing Right Here: Flashbacks show multiple incidents where officers and other higher ranking people would discuss, while Claude was very obviously in earshot, how surely the only reason he's at the top of his class is because his professors are padding his grades to keep Ronyx happy, or how the only reason Claude is getting the opportunities he does because Ronyx is trying to prop up his service record.
- The Matchmaker: A PA sees Claude becoming one for Leon, who has expressed an interest in all the female party members.
- Nice Guy: One of his defining characteristics is being willing to help out people he barely knows.
- Oblivious to Love: Seems generally unaware of Precis' attempts to flirt with him. If Claude said that he had no girlfriend in one PA involving him, Rena, and Precis, he would be genuinely confused when a Love Triangle was forming between the three, much to Rena's chagrin.
- Shared Family Quirks: Shares traits with both his father, Ronyx, and his implied mother, Illia.
- Spell My Name with an "S": The original game Second Story spelled his last name as "Kenni". It wasn't until the remake Second Evolution that his last name was spelled as "Kenny".
- Stepford Smiler: A flashback shows how Claude made himself sound more enthusiastic to be cruising on a starship for the first time than he actually was, even while the other officers tried to use him to put a good word toward his father. Since no one on Expel or Nede knows his father, he can be himself.
- Sword and Sorcerer: Him and Rena makes a Fighter and Healer pair.
- "Well Done, Son!" Guy: Claude struggles to prove himself to get out of his father's shadow.
Voiced by: Aya Hisakawa (Japanese, original), Nana Mizuki (Japanese, remake), Mayumi Iizuka (Japanese, anime), Donna Mae Wong (English, original), Eden Riegel (English, remake), Nicole Bouma (English, anime)
The heroine of the game. A cheerful young girl from the village of Arlia on the underdeveloped planet, Expel. She possesses healing powers previously unknown to her world. One day, while visiting the nearby forest, she is attacked by a monster and rescued by a man wearing strange clothes and wielding a weapon that shoots a ray of light.
- Adaptational Wimp: Rena in the games has a lot of spunk for a White Magician Girl and she knows a good deal of hand to hand combat which explains why she chose knuckles as her melee weapon of choice, and eventually knows some offensive spells. In the manga adaptation, her offensive spells are gone, but at the very least, some of her hand to hand combat traits is retained. In the EX anime, Rena not only doesn't have offensive spells, she's even more inefficient in close combat, at least until that time she was Brainwashed and Crazy.
- Clingy Jealous Girl: Celine will allude to this in one Private Action by telling Claude that Rena "can be a very jealous woman." This was shown if Welch was recruited when playing as Claude. Rena was not at all happy with the idea that Claude may be flirting with other women.
- Her anime counterpart in EX was more obvious about this as she was always pissed off whenever another girl (first Celine, later Precis) was flirting with Claude.
- Combat Medic: The main healer, but she's still good with her fists and light magic. By the time of Blue Sphere, Rena has completed medical school and regularly undertakes missions for the Federation alongside Claude.
- Deuteragonist: If Claude is chosen as the lead.
- First Girl Wins: Rena is the first girl Claude meets in the story and, while he can end up with other party members, Star Ocean: Blue Sphere confirms that they are the Official Couple.
- Gene Hunting: She decided to investigate the Sorcery Globe because she thought she would discover her origins in the process.
- Happily Adopted: Even as she wants to learn her origins, she still loves her adoptive parents.
- He Is Not My Boyfriend: Gets annoyed when people mistake Claude for her boyfriend. Her reactions don't help at all.
- Hospital Hottie: Between The Second Story and Blue Sphere she attended medical school on Earth.
- Knife Nut: In Blue Sphere, Rena trades in her knuckles for knives.
- The Medic: Healing spells were previously unknown to the people of Expel.
- Oblivious Adoption: Her adopted mother thought this was the case.
- Orphan's Plot Trinket: Her pendant.
- Pointy Ears: They mark her as not being a native Expellian.
- Strong Family Resemblance: Rena looks almost exactly like her biological mother, Dr. Rhima.
- Sword and Sorcerer: Type B (Fighter and Healer) with swordsman Claude.
- Teen Genius: It's not given as much attention as Leon and Precis, but Rena is clearly very intelligent given how quickly she adapts to advanced science and technology for someone who grew up on a medieval planet, and some of her Private Actions with Bowman also centre around her going to study at the university in Linga. It's discovered near the end of the game that Rena takes after her biological mother, one of the most brilliant scientists the Nedian race ever produced.
- In Blue Sphere, she apparently finished her medical education in less than two years and became a doctor.
- White Magician Girl: She is the main healer of the game.
- Witch Species: As a Nedian, she doesn't need to tattoo herself to use symbology, particularly the healing spells that are completely alien to Expel.
Voiced by: Yuki Kaida (Japanese, original), Saki Nakajima (Japanese, remake), Mami Kingetsu (Japanese, anime), Kana Koinuma (English, original), Megan Hollingshead (English, remake), Venus Terzo (English, anime)
A treasure hunting symbologist from the town of Marze. Claude and Rena run into her in the city of Krosse, arguing with another symbologist over a treasure map. She talks them into joining her on an expedition to a nearby cavern.
- Anti-Gravity Clothing: Celine's cape and hat-brim halo floats.
- Blue Blood: Her family is aristocracy in her hometown.
- Bound and Gagged: During a Filler episode in the anime (not even in the manga, which the anime is based on) where the party got shipwrecked into an island infested with ghosts from a ghost ship, Celine ends up being captured, tied up, gagged and eventually put on an Unwilling Suspension. Justified Trope since she'd use her mouth for spell incantations, and her getup would've been the cue for the ghosts to silence her.
- Elemental Powers: Celine tends to favor...
- Even the Girls Want Her: During a private action, Celine runs from a mob of amorous men wanting to shower her with love due to using an aphrodisiac she made. To her shock, it affected Rena.
- Exposed to the Elements: Downplayed at the snowy town of Princebridge where Celine showed discomfort at the cold. When Claude asks why doesnt she simply put on more clothes, she responds it would be against her pride and principles.
- Impossibly Cool Clothes: Her costume is standard fare as far as RPG black magician girls go, but what the heck is up with the floating shower curtains? Said outfit is a bit less impractical in the manga, but still.
- Lady of Black Magic: Celine is the textbook example; a blueblood with refined tastes who specializes in powerful offensive magic.
- Ms. Fanservice: Alongside Opera, Celine is the most endowed female in the game.
- Official Couple: Becomes the wife of Clauzer Krosse, and Queen of Krosse in the epilogue and in Blue Sphere. The Prime Minister of Expel at the time of the third game is implied to be their descendant.
- Power Tattoo: They allow her to use symbology.
- Royals Who Actually Do Something: She becomes one of these in her special ending with the prince of Krosse. Blue Sphere confirms that this is canon.
- She's Got Legs: Celine teases to Claude that some of her power tattoos are on her legs and asks if he wanted to see.
- Talking Is a Free Action: In the anime, the surrounding tends to ignore her spell incantation, except during the Marze arc, where the enemy inflicts her with Silence in the middle of incantation.
- Verbal Tic: In games, she tends to put 'darling' in her sentences.
- Why Did It Have to Be Snakes?: Bugs. But this is only in the EX anime for Celine-exclusive comedic gags, in other versions, she has no say about bugs.
Voiced by: Daisuke Sakaguchi (Japanese, original), Akira Ishida (Japanese, remake), Tomokazu Seki (Japanese, anime), David Babich (English, original), Jeffrey Maxwell (English, remake), Gabe Khouth (English, anime)
A mercenary swordsman. He takes a job to hunt the two-headed dragon in the Salva mine, but is interrupted by Claude and Rena.
- Added Alliterative Appeal: Ashton Anchors, naturally.
- Amazon Chaser:
- In the anime at least, Ashton's dragons like a woman who can fight (ie. Opera with a rocket launcher, who ironically cannot join a party with Ashton around in the proper game).
- Ashton himself averts this, since he has more of a thing for Precis in both the game and anime.
- Butt-Monkey: If anything's going wrong in a PA that isn't by the player's choice, it's gonna happen to Ashton. In the EX anime, this is taken way Up to Eleven in addition of being a No Respect Guy.
- The Chew Toy: Ashton is so unlucky that he is forced to share bodies with a twin-headed dragon, and in a rare instance of averting Story and Gameplay Segregation, he has the worst LUK stat in the game.
- One of the animations for his sprite makes it look like he was literally being nibbled on by Creepy and Weepy.
- Cursed With Awesome: Ashton has a pair of dragons grafted to his back. You can undertake a sidequest to remove them but in the end, he doesn't go through with it because the exorcism would kill the dragons.
- Crouching Moron, Hidden Badass: He's dorky-looking, a bit cowardly and has a weird fascination with barrels. He's also one of the most skilled physical fighters in the game.
- Defrosting Ice King: He's initially livid at being possessed by the dragons. If Claude and Rena take responsibility for it, he starts calming down almost immediately and is even cordial as he introduces himself to them. By the end of his sidequest, he's become Fire-Forged Friends with the rest of the party and wants to join them permanently.
- Dream-Crushing Handicap: If he's in the party during the Lacour Tournament of Arms, he'll lament that he can't participate due to being fused with Creepy and Weepy.
- Dual Wielding: With both swords and dragons.
- The Eeyore: He's a pretty morose guy, considering his crappy luck.
- Empowered Badass Normal: Ashton is a badass even before he gets two dragons grafted to his back.
- Fusion Dance: With the two-headed dragon. Hilarity Ensues.
- Gameplay and Story Integration: As noted above, Ashton's Luck stat is the worst in the game.
- Heterosexual Life-Partners: His PA's with Claude push this more than the other male party members, though it's entirely up to the player whether to enforce this or not.
- Highly Visible Ninja: His moveset includes a Flash Step and Doppelgänger Attack, so he's the closest thing the party has to a ninja. However, he also has a dragon grafted to his back and bells on his cape.
- I Just Want to Have Friends: If you complete his sidequest, he admits that this is one reason he can't go through with exorcising the dragons. It's also one of the reasons he wanted Claude and Rena to help him exorcise the dragons, and he was afraid they'd leave again after the quest was over.
- Intergenerational Friendship: his special ending, with Ill Girl Eleanor.
- Interface Spoiler: Ocassionally in the introduction to battles he'll refer to the dragons with names, even asking them if they're ready to fight. If you level him enough before finishing his sidequest, you can see he has techs which have the dragons fighting along side him, like breathing fire. This all but states he wouldn't go through with dispelling them.
- Magic Knight: He's directly referred to as a Heraldic swordsman.
- Mistaken for Gay: In Armlock, this will happen if the player chooses the "Hearthrob" in the menu; he and Claude have to share the drink (one glass, two straws). A nearby patron seems amused.
- No Respect Guy: Nobody takes the poor guy seriously in the anime. And nobody ever notices when he does something competent.
- Otaku: Ashton is an avid follower of barrels.
- People Puppets: Creepy and Weepy will occasionally possess Ashton and speak through him directly.
- Real Men Wear Pink: Rena and Chisato find a piece of jewelry among the latter's belongings, and voice their adoration for it, thinking that it might belong to a refined woman. Then they find the name inscribed on it...
- Resigned to the Call: He comes to accept being bonded with Creepy and Weepy. While he still wants to be separated from them, he'll only do it in a way that doesn't hurt them.
- Ship Tease: While he can end up with anyone, he has the distinction of getting a private action with Precis. By Blue Sphere they've become the Beta Couple.
- Symbiotic Possession: With the two-headed dragon, who helps in battle by attacking with fire and ice breaths. The posession also allows Ashton to understand the dragons language.
- Throw the Dog a Bone: Despite his dismal Luck stat, Ashton can equip several items that can give him a huge Luck boost. He can potentially end up with the highest Luck in the game, depending on what you give him.
- Two Beings, One Body: Ashton shares his body, against his will, with the two-headed dragon he fought.
- The Unintelligible: Creepy and Weepy can only growl and snarl, although Ashton understands what they're saying and can translate for others. Subverted on those rare occasions when they speak through Ashton directly.
Precis F. Newman
Voiced by: Yuko Sumimoto (Japanese, original), Rie Kugimiya (Japanese, remake), Tomoe Hanba (Japanese, anime), Kana Koinuma (English, original), Jhoanna Trias (English, remake), Tabitha St. Germain (English, anime)
A mechanically minded girl from the town of Linga. She literally runs into Claude and Rena when they arrive seeking to translate the writings found in the Krosse Cave.
- All of the Other Reindeer: She and her father are outcasts in Linga due to their affinity for machines. She wants to join because Claude was one of the first people not to reject her because of it.
- Awesome, but Impractical: Two of her powerful killer moves have to be unlocked via the Machinery skill ("Robbie's Superbeam" and "Forcefield"), with obscenely low chances of success.
- Badass Normal: It's not really touched on, but all of Precis's special attacks come from her engineering genius, rather than symbology or swordsmanship.
- Because You Were Nice to Me: Why she wants to join Claude.
- Bunny-Ears Lawyer: So hyperactive that Celine describes her as more of a tornado than a teenager. She's also a mechanical genius.
- Cute Little Fangs: In Second Evolution, Precis's new "excited" artwork has these.
- Gadgeteer Genius: She has developed robotic technology alongside her father on a planet with technology roughly that of 17th century Earth, and needed less than two years of education on Earth to learn how to build her own space ship. In the encyclopedia in the third game, it's heavily implied that technology she developed modernized Expel and along with an abundance of Energy Stone, made Expel a dominant player in galactic politics.
- Genki Girl: She is an optimistic and fun-loving girl.
- Little Miss Badass: Precis combines this with Gadgeteer Genius.
- Older Than They Look: She doesn't really look like a 15 year old. Fixed in the remakes.
- Power Fist: Fights with a pair of mechanical arms attached in her backpack, which are controlled trough a joystick.
- Rocket Punch: One of her Killer Moves.
- Ship Tease: While she can end up with anyone, she has the distinction of having a PA with Ashton.
- Significant Birth Date: Precis birthday falls on the Leap Day, and she is Older Than She Looks.
- Teens Are Short: She's tiny according to her official artwork, standing only to the shoulder of resident Child Prodigy Leon. The remake seems to have made her taller, though she's still petite.
- This is actually a case of the official artwork shot of the gang being way off scale; Precis has an official height of 5'1", which puts her over half a foot taller than Leon (who's 4'5"). She's still the second-shortest member of the party, but not by much (Rena and Opera both check in at 5'3", and Chisato at 5'4").
- Teen Genius: Precis is a genius inventor.
- Token Mini-Moe: Despite being only 2 years younger than Rena. Lessened considerably in the remake.
- Wrench Wench: Precis can even create new weapons and killer moves for herself using the machinery talent.
Voiced by: Ryo Horikawa (Japanese, original), Keiji Fujiwara (Japanese, remake), Yasunori Matsumoto (Japanese, anime), Michael G. Davis (English, original), Doug Erholtz (English, remake), Alistair Abell (English, anime)
A pharmacist and close friend of the linguist, Keith. He helps Claude and Rena get the Krosse writings translated and asks to join so that he can investigate the Sorcery globe himself.
- Action Dad: In the Blue Sphere game, Nineh is pregnant and Bowman is set to become a father. This makes Precis reluctant to take Bowman on the quest to help Ernest and Opera, but Bowman insists on coming. Nineh also encourages him to go too.
- Ascended Extra: Of sorts. When you first meet him, he's working the counter of his pharmacy. If you don't recruit him, he continues running the store as an NPC and you can shop from him there. If you do recruit him, Nineh takes over running the store for the rest of the game.
- Bare-Fisted Monk: A pharmacist who fights with his fists.
- Badass Labcoat: Bowman wears and is one of these.
- Chivalrous Pervert: Bowman continually ogles other women, but he will not cheat on Nineh.
- Combat Medic: Heavy on the combat.
- Deadpan Snarker: He has a good sense of humor.
- Doting Parent: Became one in the time skip between The Second Story and Blue Sphere.
- Happily Married: One of his Private Actions with Rena involves him getting her advice on what kind of ring to buy for Nineh. If he joins the party, Nineh will also take over running the pharmacy.
- Henpecked Husband: Somewhat-one of his Private Actions involves him getting chewed out by Nineh, and then getting mad at Claude or Rena for getting him into this mess.
- Just Friends: If he ends up with a female character, their relationship is like this.
Voiced by: Yuko Nagashima (Japanese, original), Atsuko Tanaka (Japanese, remake), Rica Matsumoto (Japanese, anime), Marie Shell (English, original), Ashley Lambert (English, remake), Willow Johnson (English, anime)
A noblewoman from one of the artificial moons orbiting the dead planet Tetragenesis. She is searching for her lover, Ernest Raviede, who had travelled to Expel on one of his expeditions, and ends up crashing.
- BFG: Opera's weapon. Aside from Killer Moves and flying enemies, all she does is hit people with it.
- Clingy Jealous Girl: Some of her new Private Actions in the PSP version show her as this. She warns Rena and Welch of the dangers of pursuing Ernest, and she even beats Ernest up when she mistakenly thinks he's flirting with Precis.
- Hard-Drinking Party Girl: She sure loves her wines.
- Lady of War: She's pretty refined, but she can kick some ass.
- Ms. Fanservice: The party's most sexually appealing party member, alongside Celine.
- Pistol-Whipping: Against ground enemies, Opera will instead whip her rifle close range. In Second Evolution, she'll smack twice first before actually shooting.
- Rebellious Princess: Opera's parents do not approve of her adventurous nature.
- Royals Who Actually Do Something: The Vectras are the suzerain house of Tetragenesis, effectively making Opera the princess of her species. Despite this, she is an active adventurer and a powerful asset in combat.
- Rubber-Forehead Alien: Opera looks like a three-eyed human.
- She's Got Legs: It's why she gets offended when an arena announcer mistakes her for a man.
- Strong Family Resemblance: One of Ernest's endings reveals that Opera has a younger sister named Opal, whose only physical difference is her hair color. Said sister also has a massive crush on Ernest.
- Third Eye: Like all Tetrageniots. Her improved depth perception compared to other humans makes her a very good markswoman.
- Wrench Wench: Not as obvious as Precis, but Opera is a skilled mechanic who can create new weapons and killer moves with the machinery talent.
Voiced by: Hiroki Tochi (Japanese, original & remake), Hiroshi Yanaka (Japanese, anime), Phillip Mayall (English, original), Terrence Stone (English, remake), Trevor Devall (English, anime)
An archeologist from a moon of Tetragenesis. He travelled to Expel on one of his expeditions.
- Adventurer Archaeologist: One of his Private Actions in the remake is an obvious shout out to Indiana Jones.
- Badass Bookworm: In his ending with Noel, Ernest reveals he can't stand Know Nothing Know It Alls who never do any fieldwork and just write papers. He's less than thrilled about being honored by them. Half the fun, for Ernest, is the thrill of exploring old ruins and encountering dangers.
- Badass Teacher: Teaches at a university when not on an expedition.
- Celibate Hero: To a certain extent. Despite having women fall over him left and right (including more than one of the female party members), Ernest is far less interested in romance than he is in adventure and research. When Rena asks him why he doesn't return Opera's affections, Ernest replies that he isn't even certain about his own feelings. The fact that Opera is a Clingy Jealous Girl doesn't help either, although his romantic rating for her is highest when he joins the party.
- Chick Magnet: In addition to gaining the affections of both Vectra sisters, Celine's starting romance rating for him is almost as high as Opera's. In a new Private Action added to the PSP version, he and Dias get ogled by a bunch of female passerby in North City. You can also have Rena gush over them, too.
- Expy: He seems to be the Star Ocean universe's response to Indiana Jones. One of his Private Actions in Second Evolution has him discuss getting into chases in mine carts, among other Indy references. Claude has to explain that those are fiction and that ruins on Earth are largely the same as everywhere else, to Ernest's disappointment.
- Legendary in the Sequel: Ernest's archeological theories are still held in high authority four-hundred years later.
- MayDecember Romance: At least by Japanese video game standards. Assuming he eventually hooks up with one of the female party members, he'll be at least 12 years older than her.
- Rubber-Forehead Alien: As a Tetrageniot, Ernest looks like a human with a Third Eye.
- Whip It Good: His weapon of choice.
Voiced by: Ryo Horikawa (Japanese, original), Tomokazu Sugita (Japanese, remake), Takehito Koyasu (Japanese, anime), Phillip Mayall (English, original), Kyle Hebert (English, remake), Brent Miller (English, anime)
Rena's childhood friend. He left Arlia after the death of his family to wander as a mercenary.
- Always Someone Better: To Claude, as it's impossible to defeat him in the arena.
- Ascended Extra: Of sorts. In the original PSX version, he only ever sleeps during Private Actions. However, in Second Evolution he actually interacts with Rena and other characters in several Private Actions.
- Badass Baritone: His voice in every versions is considerably lower than the rest of the team, and he's acknowledged as one of the biggest badasses in the party.
- Badass Normal: He's pretty ordinary, but proves to be deadly with a sword on skill alone.
- Bishōnen: Though he's more mature looking than Claude and Ashton.
- Boring, but Practical: Dias' moves aren't that flashy and didn't hit as much as Claude and Ashton, but they're fast and ideal to use for interrupting enemies without getting too close and have fast recovery time in case he whiffs. Most exaggeratedly, two of his initial Killer Moves, Air Slash and Chaos Sword. Both are cheap enough to be spammable and carries to the whole game while also saving MP-recovery items, and the former moves way faster than Claude's thus very ideal to interrupt bosses that move utterly fast that make positioning for the fancier moves really hard.
- Chick Magnet: Ernest noticed this and decided to have some fun in North City.
- Crutch Character: In Rena's scenario. Mega powerful when he's just with Rena, but Claude will surpass him once he joins for good due to Claude's Killer Moves likely to hit more. May be subverted, due to having some techniques that have high accuracy (Air Slash) and speed to interrupt things and him having some options to break the damage limit, making Dias still very viable even at the end of the game or against Gabriel Celeste or Iselia Queen.
- Cynicism Catalyst: Seeing his parents and younger sister murdered by bandits.
- Defrosting Ice King: He doesn't care for any of the other characters except for Rena (who he grew up with) and Claude (who earns his respect after the Tournament of Arms). However, he can warm up to them, especially in Second Evolution when he can interact with them in Private Actions.
- Heavy Sleeper: Most of the time in Private Actions, you see Dias sleeping. And that's his hobby, too.
- Hooked Up Afterwards: with Chisato Madison in Blue Sphere. They are the only ones with a special romantic ending together in the game. In the current mobile game Star Ocean Anamnesis, Dias expresses that he is happy to see Chisato during her introduction event (in a rather roundabout way, but that is usual for him). While in Second Evolution they have no private actions together and their ending was changed to a non-romantic one, this ending has since been regarded as happening pre-Blue Sphere.
- Ineffectual Loner: Wishes to be alone, but Rena don't let him.
- The Lancer: Dias has this personality in general. If he's in the party during Rena's scenario, the rest of the heroes will be upset that Claude is missing when they wash up on the Continent of El. Dias is the one who reminds them that they need to get moving and that they may be able to find Claude later.
- Like Brother and Sister: His relationship with Rena.
- Master Swordsman: He's a sword expert and wields his sword like an Iaijutsu Practitioner.
- Redemption Demotion: Dias is a Master Swordsman who is impossible to defeat in the tournament, but when recruited in Rena's story, he becomes a Crutch Character.
- The Rival: To Claude.
- Shipper on Deck: You wouldn't believe it from someone like him, but yes he is one. Outside of Private Actions, he assures Claude that he doesn't see Rena as anything more than a little sister, and in an actual PA, he tells Rena that she is the support that someone like Claude needs.
- The Stoic: Dias is aloof and very serious. Rena is the only person whom he opens up with.
- Sweet Tooth: For such a tough and stoic character, a PA reveals that he really likes chocolate parfaits.
- Troubled, but Cute: Dias still struggles with his pain over watching his parents and little sister die in front of him, which gives him an often bleak outlook on life. He's also a handsome Bishōnen who several women in North City drool over in a Second Evolution Private Action. You can also have Rena gush over him in that same PA.
- Worthy Opponent: His viewing Claude as this is shown by his having Gamgee give Claude a specially sharpened blade.
Leon D. Geeste
Voiced by: Yuki Kaida (Japanese, original), Yumiko Kobayashi (Japanese, remake), Grant Wachspress (English, original), Zack Goldman (English, remake)
A prodigy working with his parents in the Kingdom of Lacuer's weapon research division. Claude and Rena are enlisted to help him find the final component of the weapon that will beat back the monsters spawned by the Sorcery Globe.
- Badass Bookworm: Leon is a pretty powerful mage, plus his weapon is a book.
- Badass Labcoat: Leon, being a scientist, is also this.
- Break the Cutie: Only exclusively on Claude's scenario, when Leon found out that he's possibly the Sole Survivor after the destruction of Lacuer's Hope, and his parents nowhere to be seen, he completely drops his Insufferable Genius manner and starts bawling like he's a kid left all alone in the world and started wishing that he should have died instead. Took Claude to slap him and telling him to place his hope somewhere else to calm him down.
- Cat Boy: A fellpool for no readily apparent reason. The third game's dictionary explains this as being a result of both of Leon's parents carrying a certain recessive gene on the twelfth chromosome. A new private action in Second Evolution also addresses the issue.
- Child Mage: He is twelve years old during the game, and is a Black Mage.
- Elemental Powers: Leon favors using...
- Improbable Weapon User: Books. It's less silly than it sounds, as he's not actually hitting enemies with the book you equip on him; his physical attack is summoning a demon from his book to do the work for him.
- Insufferable Genius: At first.
- Legendary in the Sequel: Four-hundred years later, Leon is still famous for his work on developing Symbological Science.
- Not So Above It All: Actually enjoys a Fun City skit that parodies the Sentai genre that was meant for kids his age.
- Power Tattoo: Unless he keeps the symbols in his books, he has unseen tattoos that allow him to use symbology.
- Precocious Crush: He develops one on every one of the female party members. One Private Action centres around him confessing to Claude. Claude then has to decide which girl to reveal this to, and whether he or Leon gives her the news.
- Teen Genius: Though Leon is actually a preteen example, being just 12 years old. He becomes one proper in Blue Sphere. In Blue Sphere and Till the End of Time, it's revealed that Leon was instrumental in expanding the Federation's knowledge of symbology.
- Token Mini-Moe: At 12, he's the youngest of the cast. His sprite stands at half the size of everyone else.
Voiced by: Daisuke Sakaguchi (Japanese, original), Takahiro Mizushima (Japanese, remake), Jimmy Freeman (English, original), Peter Doyle (English, remake)
A zoologist overseeing a nature reserve on Energy Nede. He helps Claude and Rena seek out the last wild psynard.
- Badass Teacher: He is a university professor.
- Crutch Character: In Blue Sphere. He's the only healer available until Opera and Rena join much later.
- Eyes Always Shut: As seen in his character portrait.
- Friend to All Living Things: He and Rena potentially bond over this.
- Master of None: Noel can heal, but can't even come close to matching Rena. He can use attack magic, but Celine and Leon have him beat there. He equips knuckles as his Weapon of Choice, but all of the fighters beat him in physical combat, as does Rena.
- The Medic: Noel serves as a combination of this and a Black Mage.
- Oblivious to Love: He has no idea that his assistant has a massive crush on him.
- Pointy Ears: As a Nedian, he has elven-like ears.
- The Red Mage: He can cast both healing and offensive spells.
- Witch Species: As a Nedian, he can use symbology without the tattoo.
Voiced by: Rumi Kasahara (Japanese, original), Fuyuka Ano (Japanese, remake), Jessica Heidt (English, original), Julie Ann Taylor (English, remake)
A reporter for the Nede Chronicle, the biggest newspaper in Energy Nede. She follows Claude and Rena around because she thinks they're the biggest story to happen in her lifetime.
- Badass Normal: She's just a skilled martial artist, in spite of the fact that all Nedians are supposed to be able to use Symbology. According to Star Ocean Anamnesis, there is a reason for that...
- Dangerously Short Skirt: gets a Minidress of Power makeover in Blue Sphere (with bonus Zettai Ryouiki in the mobile game adaptation) which might help explain how she Hooked Up Afterwards with Dias...
- Intrepid Reporter: Chisato is a reporter and follows Claude and Rena in their quest to save the universe.
- Pintsized Powerhouse: Despite her looks, Chisato is a skilled melee fighter who attack with punches and kicks.
- Pointy Ears: As a Nedian, she has elven-like ears.
- Properly Paranoid: She picks up on how odd it is that, in billions of years, no alternative versions of the Ten Wise Men story has surfaced. She's very right to be suspicious.
- Witch Species: She opts not to take advantage of it for an unknown reason. in Star Ocean Anamnesis it is strongly implied that she was born without the special gene that grants Nedians the ability to use Symbology, though the dictionary in Star Ocean: Till the End of Time implies that Chisato was still able to pass the ability to her own descendants.
Voiced by: Tomoe Hanba (Japanese), Melissa Fahn (English)
A new character added in Second Evolution version, Welch is a young girl with a peculiar sense of style who always carries around a big pointer. A self-designated creator, she claims that she builds various useful items, but the details are unknown. She semi-forcefully decides to join Claude and the others on their venture.
Tropes about her are listed in the main page.
Ronyx J. Kenny
Voiced by: Kenji Hamada (Japanese, remake), Sam Gold (English, remake)Claude's father.
- Famed in Story/Legendary in the Sequel: His exploits as a Federation officer, not least of all being the events of Star Ocean 1, has earned him quite a reputation.
- Heroic BSoD: When he thought Claude has doomed himself when he returned to Expel, right when it's nearing its destruction.
- Killed Off for Real: Along with his entire crew.
- Older and Wiser
- Retired Badass: He hasn't retired from the military, but he doesn't really fight anymore.
- Sudden Sequel Death Syndrome: Being the only character from the first game to return, Ronyx and is killed by the Ten Wise Men.
PhiliaA mysterious girl Claude meets at Kurik.
- Artificial Human: After she was killed in a terrorist attack, her father transferred her consciousness into an artificial body.
- Mad Scientist's Beautiful Daughter: The beloved daughter of Dr. Lantis, creator of the Ten Wise Men. It was her death that prompted him to alter the programming of the Wise Men to seek the destruction of everything.
- Morality Pet: For her father, Gabriel.
- Power Limiter: Her very existence keeps Gabriel's power restrained. When he kills her for betraying him...
- Walking Spoiler: The above tropes reveals much about her identity.
ChrisThe prince of Krosse.
- Voiced by: Bill Reed (English, remake)
- Unreliable Expositor: The history of Nede he shares with the party is rather grossly inaccurate. Justified in that he's no more aware of the truth than the party is.
Ten Wise Men
- Dub Name Change: In the PlayStation version, the Ten Wise Men had their names changed to remove the Religious and Mythological Theme Naming. The PSP version fixed that.
- Nigh-Invulnerability: Thanks to their force field.
- Person of Mass Destruction: Also border on physical gods since it requires the special anti-matter weapons to damage them.
- Religious and Mythological Theme Naming: They're all named after archangels.
- Super Soldier: In reality, they are a group of biological weapons created by Dr. Lantis in order to destroy the universe.
Gabriel/Dr. Lantis (Indalecio)
Voiced by: Masaharu Satou (Japanese, original), Rikiya Koyama (Japanese, remake), Erik Bergmann (English, original), Richard Epcar (English, remake)The Leader of the Ten Wise Men.
- Artificial Human: Following the death of his daughter, Dr. Lantis created a new body for himself, becoming the tenth Wise Man.
- Big Bad: As the leader of the Ten Wise Man, he is the final antagonist of the story.
- Despair Event Horizon: The death of his daughter.
- Final Boss: He is the last enemy of the game.
- Historical Hero Upgrade: In-universe, he went from the creator of the Ten Wise Men to the scientist who provided the means for defeating them. The former is the truth, while the latter is from the doctored history records that Nall related to the heroes.
- Light Is Not Good: Gabriel's primary power involves Light. He is about as "good" as a cobra.
- Omnicidal Maniac: Destroys planet Expel in the end of the first disc, and plans to do the same with Energy Nede and everything else that exists.
- Significant Green-Eyed Redhead: An evil version.
- True Final Boss: Gabriel Unlimited, who can only be fought if you the sidequests and discover the entire story behind the Ten Wise Man.
Voiced by: Kensaku Kobayashi (Japanese, original), Shin-ichiro Miki (Japanese, remake), Brian Vouglas (English, original), Dick Neptune (English, remake)The second most powerful of the Ten Wise Men.
- Artificial Human: Was originally created to be the leader of the Ten Wise Men, but then their creator's daughter was killed...
- Blow You Away: Winds of Destruction, his strongest spell.
- Demoted to Dragon: Lost his status as a result of Dr. Lantis making himself the leader of the Ten Wise Men.
- Peek-a-Bangs: At least in his new anime mugshot in Second Evolution.
- The Starscream: He makes no secret about this to the party before they fight.
- We Can Rule Together: Say this to the party before being confronted.
- White Hair, Black Heart: Even compared to the other Wise Men, Lucifer stands out as the most treacherous one, as he send the other members to their deaths so he can overthrown his boss and rule the universe alone.
Voiced by: Kensaku Kobayashi (Japanese, original), Taiten Kusonoki (Japanese, remake), Steven Memel (English, remake)One of the two Ten Wise Men fighting the party midway of the tower of Phynal. A physical-based fighter with spells and petrification beams.
Voiced by: Hiroki Tochi (original & remake), J.S. Gilbert (English, original), Peter Spellos (English, remake)One of the two Ten Wise Men fighting the party midway of the tower of Phynal. An Ax-Crazy pyromaniac who wants you to BURN.
- Astonishingly Appropriate Appearance: His design is associated with red and he use fire powers.
- Dishing Out Dirt: He can cast Earthquake in the PS1 version. This was removed in the PSP port.
- Dual Boss: With Haniel.
- HeelFace Turn: In Star Ocean Anamnesis. He is convinced to join the heroes by the series protagonist Evelysse. This has resulted in the oddest shipping in the series. To date he is the only boss to become a playable character.
- Large Ham: Oh God. Due to the original game's voice acting, he's one of the most stand out examples of hamming it out.
- Playing with Fire: Use fire-based attacks.
Voiced by: Dai Matsumoto (Japanese, original), Kiyomi Yazawa (Japanese, remake)One of the three Wise Men who guard the entrance to Fineal. A young child of the Wise Men with honorable manners to his enemies.
- Affably Evil: Probably the kindest of the the Wise Men. He greets the party and even apologizes when he mistakes Claude for being an Expellian.
- "Blind Idiot" Translation: His last words, What!? I hear nothing about that!
- This is fixed in Second Evolution.
- Evil Genius: Uses speed and quick attacks on the enemy. Also under Haniel and was made to be information gatherers for the Ten Wise Men Project.
- Girl with Psycho Weapon: Male example. Zadkiel uses large tuning fork as a weapon.
- Really 700 Years Old: He may look very young, but like the other Wise Men, he's more than a billion years old.
- Teleport Spam: Uses this for moving.
- Unwitting Instigator of Doom: Was one of the two who discovered the truth about Filia's death.
- Wave-Motion Tuning Fork: Literally.
Voiced by: Taketora (Japanese, remake)One of the three Wise Men who guard the entrance to Fineal. An elderly man with a third eye (maybe one eye, he has a visor that make it hard to tell) who seems to know much if you ask him about anything.
- Affably Evil: Explains Claude origins to the other party members and swears to make their deaths as painless as possible.
- Captain Ersatz: Resembles Keel from Neon Genesis Evangelion
- Evil Genius: He seems to know quite a lot. Also under Vesper and one of the two information gatherers for the Ten Wise Men Project.
- Unwitting Instigator of Doom: Was one of the two to discover the death of Filia.
- Villains Never Lie: His information is as accurate as he can make it. This is shown when he clearly explains to the party that Claude is from another world.
Voiced by: Daiki Nakamura (Japanese, original), Haruo Satou (Japanese, remake)One of the three Wise Men who guard the entrance to Fineal. A mysterious hooded being who doesn't talk much.
Voiced by: Kenji Hamada (Japanese, remake)One of the Wise Men first encounter and the first to fight in battle. He has the behavior of a knight and is a master at defense.
- Affably Evil: See Let's Fight Like Gentlemen. He compliments their fighting ability, but calls them out for not looking at other people's perspectives.
- Barrier Warrior: His best ability is a shield that renders him indestructible for a short amount of time.
- The Brute: Fights with sheer fighting strength. Also serves under Michael and was made the base defense unit for the Ten Wise Men Project.
- Captain Ersatz: His portrait in Second Evolution makes him look like if the Ten Wise Men reprogrammed RoboCop.
- Hopeless Boss Fight: The first battle against him is unwinnable.
- Let's Fight Like Gentlemen: Offers a fight against the party before Expel collides with Nede.
- Stone Wall: His defense is the best about him.
Voiced by: Hidenari Ugaki (Japanese, original), Riki Kitazawa (Japanese, remake)One of the Wise Men during the assault of Fun City. A cyborg-like being that looks down on sapient species.
- Captain Ersatz: From his look, it's like the Ten Wise Men hired and cyborgified Psycho Mantis (without the mind screw). The original English version even gave it a pseudo-Shout-Out via his name Shigeo, which is about two (or three) consonants away from the text that appeared in the blank screen whenever Psycho Mantis does his Mind Screw ability (Hideo).
- The Faceless: The helmet hidden his face.
- Sadist: Enjoys killing civilians during the assault on Fun City.Jophiel: MORE. MORE. I WANT TO SEE MORE PAIN, MORE SUFFERING!